We begin by defining the notion of a \(\delta \) -regular weak Abelian fibration, first introduced by B.C. Ngô in [1]}. Let \(g \colon G \rightarrow B\)  be a smooth commutative group scheme over \(B\)  and \(g^0 \colon G^0 \rightarrow B\)  be the identity component. Given a point \(b \in B\) , there is the canonical Chevalley devissage short exact sequence
\(0 \rightarrow R_b \rightarrow G^0_b \rightarrow A_b \rightarrow 0\) 
